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Best SpeedX Alternatives
Here are some Firefox add-ons that are similar to SpeedX:
Video Speed Controller
Acker
2 0.00 
(0) 
SpeedZ
Acker2
1 0.00 (0) 
SpeedyVideo Extension
Great Idea Technology Limited
441 5.00 (4) 
Video Playback Speed Adjuster
minhquangdn
15 0.00 (0) 
speederVideo
haleem
5 0.00 (0) 
FastForwarder
Nick
38 0.00 (0) 
Video Speed Controller
seoxiis
229 3.00 (4) 
Video Speed Controller
codebicycle
103K 4.53 (801) 
Video Speed Controller X
Danny Lin
13 0.00 (0) 
YouTube SpeedUp
GoliafRS
1K 4.16 (19) 
Simple Video Speed Controller
Chaseos Apps
105 0.00 (0)